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Solid State Mcq Neet Chemistry
Quiz 4
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Q.1
A mineral is made of calcium, titanium and oxygen, Ca2+ ions located at corners, Ti4+ ions are at the bodycentre and O2- ions at face-centre of the unit cell, The molecular formula of the mineral is ..
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a) CaTiO2
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b) CaTi2O3
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c) CaTiO3
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d) XaTi2O4
Explanation
Ca2+ at corners Number of ions perunit cell = 8×(1/8) T4+ is at body centre Number of ions per unit cell = 1 O2- are at face-centre Number of ions per unit cell = 6 ×(1/2) =3 Thus formula CaTiO3 Answer : (c)
Q.2
AB crystallises in body-centred cubic lattice with edge length 387pm. Distance between oppositely charged ions will be ..[ BHU 2009]
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a) 200 pm
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b) 250 pm
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c) 300 pm
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d) 335 pm
Explanation
Distance between oppositely charged ion is half of the corner diagonals Answer : (d)
Q.3
8:8 coordination of CsCl is found to change into 6:6 coordination
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a) on increasing the pressure
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b) on increasing the temperature
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c) on decreasing the pressure
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d) on decreasing the temperature
Explanation
Answer : (b)
Q.4
Fe3O4 is ferrimagnetic at room temperature but at 850K, it becomes
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a) paramagnetic
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b) diamagnetic
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c) ferromagnetic
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d) non-magnetic
Explanation
Answer : (a)
Q.5
The number of atoms contained in one face-centred cubic unit cell of mono-atomic substance is
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a) 1
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b) 2
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c) 3
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d) 4
Explanation
Answer : (d)
Q.6
Schottky defects occur mainly in electrovalent compounds where
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a) positive ions and negative ions are of different size
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b) positive ions and negative ions are of same size
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c) positive ions are small and negative ions are big
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d) positive ions are big and negative ions are small
Explanation
Answer : (b)
Q.7
In Schottky defect ...
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a) Some of lattice sites are vacant
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b) an ion occupies interstitial position between lattice points
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c) a lattice site is occupied by electron
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d) the radius ratio r+/r-, is low
Explanation
Answer : (a)
Q.8
The inter ionic distance for cesium chloride crystal will be
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a) a
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b) a/2
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c) a(√3/2)
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d) 2a√3
Explanation
Answer : (c)
Q.9
In an NaCl crystal, each chloride ion is surrounded by ...
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a) 6 sodium ions
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b) 6 chloride ions
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c) 8 sodium ions
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d) 4 sodium ions
Explanation
Answer : (a)
Q.10
Amorphous solids may be considered as ...
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a) molecular solids
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b) supercooled solids
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c) supercooled liquids
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d) covalnet network solids
Explanation
Amorphous solids like glass and plastic are considered as supercooled liquids Answer : (c)
Q.11
The anions (A) form hexagonal closed packing and atoms (M) occupy only two-third of octahedral voids in it; the general formula of the compound is ...
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a) MA
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b) A2
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c) M2A3
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d) M3A2
Explanation
Answer : (c)
Q.12
First three nearest neighbor distance for primitive cubic unit cell will be ( edge length of unit cell = l)
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a) l, l√2, 2l
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b) l, l√2, l
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c) l, l√2, l√3
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d) l√3, l√2, l
Explanation
Answer : (c)
Q.13
Close packing is maximum in the crystal lattice of
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a) face-centred cubic
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b) body-centred cubic
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c) simple-centred cubic
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d) none of these
Explanation
Answer : (a)
Q.14
The unit cell of a binary compound of A and B metals has a ccp structure with A atoms occupying the corners and B atoms occupying the centres of each faces of the cubic unit cell. If during the crystallisation of this alloy, in the unit cell two A atoms are missed, the overall composition per unit cell is ...
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a) A6B24
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b) AB4
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c) AB6
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d) AB8
Explanation
Two atoms missing thus total atoms of A = 6 Number of 'A' atoms per unit cell = 6×(1/8) = 3/4 Number of atoms of B per unit cell = 6 × (1/2) =3 A:B = (3/4):3 = 1:4 Answer : (b)
Q.15
Which defect causes decrease in the density of a crystal?
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a) Schottky
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b) Frenkel
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c) F-centre
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d) Interstitial
Explanation
Answer : (a)
Q.16
The coordination number of a metal crystallizing in hexagonal close packing structure is
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a) 4
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b) 6
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c) 8
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d) 12
Explanation
In three dimensional hexagonal close packing of crystals, the two dimensional hcp layers are arranged in ABAB. The atoms in A layers are exactly above (or below) one type of the trigonal voids in B layer. The central atom in B layer is immediately surrounded by 12 atoms i.e., 6 in layer B and 3 each in two A layers. Answer : (d)
Q.17
The closest-packing sequence ABC ABC ... represents
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a) primitive cubic packing
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b) body-centred cubic packing
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c) face-centred cubic packing
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d) hexagonal packing
Explanation
face-centred cubic or Cubic closed packing, a type of packing has ABCABC…. type of arrangement of the layer i.e. the first three layers are quite different from each other but this set of layer is repeated over and again the addition of more layers Answer : (c)
Q.18
A metallic crystal crystallizes into a lattice containing a sequence of layers AB AB AB. A packing of sphere leaves out voids in the lattice. What is the percentage of volume of this lattice in empty space?
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a) 26%
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b) 50%
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c) 74%
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d) None of these
Explanation
Answer : (a)
Q.19
he number of crystal system known are ...
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a) 4
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b) 6
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c) 7
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d) 8
Explanation
Answer : (c)
Q.20
In closed packed array of N spheres, the octahedral holes are
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a) N/2
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b) N
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c) 2N
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d) 4N
Explanation
Answer : (b)
Q.21
A crystal lattice with alternate +ve and -ve ions has radius ratio 0.524, its coordination number is ...[ PMT 2002]
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a) 3
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b) 4
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c) 6
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d) 12
Explanation
Radius ratio = 0.414 - 0.732 , coordination number =6 , structural arrangement = octahedral, crystal type =NaCl Answer : (c)
Q.22
If we mix a pentavalent impurity in a crystal lattice of germanium, what type of semiconductor formation will occur? ..[ CBSE 1996]
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a) p-type semiconductor
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b) n-type semiconductor
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c) both types
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d) none of these
Explanation
four electrons of pentavalent impurity form a covalent bonds with germenium and one electron remains free for conduction. As majority carrier is negative charge it is n-type semiconductor Answer : (b)
Q.23
A metal crystallised with a body-centred cubic lattice. The edge of the unit cell is 240√3 pm. The diameter of the metal atom ion is ..[ AIPMT 2012]
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a) 180 pm
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b) 360 pm
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c) 288 pm
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d) 408 pm
Explanation
For body centred cubic cell a√3 = 4r diameter = 2× radius d = 2×180 = 360 pm Answer : (b)
Q.24
In a solid lattice, the cation has left a lattice site and is located at an interstitial position. the lattice defect is ...[ BHU 2008]
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a) Interstitial defect
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b) Vacancy defect
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c) Frenkel defect
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d) Schottky defect
Explanation
Answer : (c)
Q.25
The packing fraction of the element that crystallises in Body -centred cubic unit cell arrangement is
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a) π/6
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b) π/2
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c) π/4
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d) π/3
Explanation
In simple cell a = 2r For simple cubic arrangement, number of particle per unit cell =Z = 8×(1/8)+1 = 2 Answer : (d)
Q.26
Tetragonal crystal system has the following unit cell dimensions ...[MPPMT 1993]
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a) a=b=c and α=β=γ=90°
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b) a=b≠c and α=β=γ=90°
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c) a≠b≠c and α=β=γ=90°
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d) a=b≠c and α=β=90°, γ=120°
Explanation
Answer : (b)
Q.27
How many unit cells are there in 1 g of NaCl?
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a) 6.023×1023
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b) 2.57×1021
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c) 2×6.023×1023
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d) 4×6.023×1023
Explanation
NaCl is fcc thus one unit cell have 4 ions or Z =4 Therefore number of unit cell will be Answer : (b)
Q.28
In unit cell of NaCl lattice, there are ..
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a) 3Na+ ions
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b) 4NaCl units
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c) 6Na+ ions
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d) 6Cl- ions
Explanation
Na Cl is fcc structure Ions at corner = 8×(1/8) = 1 Ions at face = 6×(1/2) = 3 In a unit cell of NaCl there are 4 units of NaCl Answer : (b)
Q.29
In hexagonal close packed (hcp) structure of spheres, the fraction of the volume occupied by the sphere is A. In a cubic closed packed structure, the fraction of the volume occupied is B. The relation between A and B is
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a) A = B
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b) A > B
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c) A < B
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d) both cannot be compared
Explanation
the percentage of space occupied by spheres in hexagonal cubic packing (hcp) is 74% = A cubic closest packing also efficiently fills up 74% of space = B ccp arrangemen is ABC ABC ... arrangement hcp arrangement is AB AB ... arrangement Answer : (a)
Q.30
Which of following network solid is an exceptionally good conductor of electricity?
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a) Si
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b) SiC
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c) Graphite
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d) SiO2
Explanation
Three out of four electrons of carbon are involved in bonding while fourth electron remains free to conduct electric current Answer : (c)
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